Abundances of Chemical Elements in the Earth’s Crust

 

Element and Symbol Percentage by weight Percentage by number of atoms Percentage by volume
Oxygen (O) 46.6 62.6 93.8
Silicon (Si) 27.7 21.2 0.9
Aluminum (Al) 8.1 6.5 0.5
Iron (Fe) 5.0 1.9 0.4
Calcium (Ca) 3.6 1.9 1.0
Sodium (Na) 2.8 2.6 1.3
Potassium (K) 2.6 1.4 1.8
Magnesium (Mg) 2.1 1.9 0.3
All other elements 1.5 _______ _______
100 100 100